This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A104271 #16 Feb 21 2025 11:49:08 %S A104271 3,6,42,21,75,91,186,378,3051,987,1670,4182,6531,1494,8435,9705,22161, %T A104271 5166,16110,16869,154709,57099,31658,52394,401481,176811,101350, %U A104271 105573,678357,241883,501717,393818,284003,685542,1437354,1751297,3225579 %N A104271 First element of first run of exactly n consecutive numbers not of form x^2+y^2. %C A104271 Gives the position of the start of the first run of exactly n consecutive zeros in A004018. %H A104271 Hugo Pfoertner, <a href="/A104271/b104271.txt">Table of n, a(n) for n = 1..122</a> %Y A104271 Cf. A022544, A004018. %K A104271 nonn %O A104271 1,1 %A A104271 _David W. Wilson_, Feb 26 2005